Seattle to Pasco/Kennewick/Richland

What the Data Says About SEA to PSC

The Seattle to Pasco/Kennewick/Richland corridor (SEA → PSC) covers roughly 172 miles and is served by 5 carriers, based on Bureau of Transportation Statistics reporting. Across 13,307 flights in the dataset, this route posts a 85.9% on-time rate with an average delay of 62.7 minutes when flights run late. Over the most recent 24 months of BTS data, 3,818 flights were recorded on this pairing — 23 cancelled (0.6%) and 4 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 5 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 13,307 total flights analyzed, the 85.9% on-time figure is statistically meaningful rather than a small-sample fluke. The 62.7-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Nov 2024 posted the best performance on this corridor at 90% on-time, while Feb 2025 came in at 68% on-time — a 22-point gap between best and worst recent month. For travelers evaluating the SEA to PSC route, the combination of a 85.9% on-time rate, 62.7-minute average delay, 0.6% recent cancellation rate, and 5 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.